Method for actively balancing a vibrating gyroscope sensing element

(19)

(11)

EP 0 736 749 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	15.10.1997 Bulletin 1997/42

(43)	Date of publication A2:
	09.10.1996 Bulletin 1996/41

(21)	Application number: 96302292.6

(22)	Date of filing: 01.04.1996

(51)	International Patent Classification (IPC)⁶: G01C 19/56

(84)	Designated Contracting States:
	DE ES FR GB IT NL SE

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Priority:

07.04.1995 GB 9507253

(71)	Applicant: BRITISH AEROSPACE PUBLIC LIMITED COMPANY
	Farnborough, Hants. GU14 6YU (GB)

(72)	Inventor:
	Fell, Christopher Plymouth, Devon, PL6 6DE (GB)

(74)	Representative: Rooney, Paul Blaise
	British Aerospace plc, Corporate Intellectual Property Department, Park East, PO Box 87, Farnborough Aerospace Centre Farnborough, Hants GU14 6YU Farnborough, Hants GU14 6YU (GB)

(54)	Method for actively balancing a vibrating gyroscope sensing element

(57) A vibrating structure gyroscope sensing element structure of ring-like or substantially cylindrical form made of ferromagnetic material is actively balanced by applying a variable strength magnetic field across a predetermined section of the circumference of the sensing element structure differentially to shift the resonant frequency of one or the other of the primary and secondary vibration modes (1,2) thereof by an amount sufficient to bring the two mode resonant frequencies into balance.

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